After nearly three years since the largest gas blowout in U.S.history, residents of Porter Ranch still worry whether their health will be compromised five, 10 or 20 years down the road after breathing in not just methane gas, but an array of toxic, often cancer-causing chemicals spewed from an underground gas storage facility in and around their suburban neighborhood.

California Sen. Dianne Feinstein on Monday announced her support for a state bill that would stop the reopening of the Aliso Canyon natural gas storage facility until the root cause of a massive leak that occurred there is determined.

In 2014, Southern California Gas Co. asked state officials for a rate hike to pay for an ambitious, "highly proactive" safety program to test all 229 of its active natural gas injection wells "before they result in unsafe conditions."